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Potential suitable sites for the calibration of Scientific Echo Sounder in the marginal seas around Antarctica

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Advances in Polar Science 2022年第1期33卷 102-109页

作者： CHEN Qingman GUO Guijun luo guangfu HE Jianfeng Key Laboratory of Polar Science MNRPolar Research Institute of ChinaShanghai 200136China First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory of Marine Science and TechnologyQingdao266237China

The in situ calibration of Scientific Echo Sounders(SESs)in the Southern Ocean is crucial for accurate assessments of Antarctic krill and fishery *** of the occurrence of strong winds,waves,and sea ice coverage in most seasons,SES calibration is usually difficult to perform in the Southern ***,it is essential to identify potential sites suitable for SES calibration in the marginal seas around Antarctica to successfully calibrate SESs in the Southern *** synthetic analyses of the wind,surface current,and sea ice concentration in the targeted seas,we found that the polynya in the southeast Prydz Bay,close to the Chinese Zhongshan Station,is an ideal location to calibrate SESs based on its weak wind and surface current and its ice-free coverage during Antarctic *** of the SESs onboard the research vessels of Xuelong and Xuelong 2 during the 36th and 37th Chinese National Antarctic Research Expeditions indicate that this location is a potential suitable site for conducting SES calibration with the vessel in a drifting mode.

关键词： acoustic calibration Scientific Echo Sounder coastal current wind speed sea ice Antarctic

Characteristics of hydrogen/oxygen isotopes in water masses and implications for spatial distribution of freshwater in the Amundsen Sea,Southern Ocean

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Advances in Polar Science 2021年第3期32卷 221-238页

作者： SHAO Hebin HE Jianfeng luo guangfu LAN Musheng YU Lejiang GUO Guijun LIAN Ergang MNR Key Laboratory for Polar Science Polar Research Institute of ChinaShanghai 200136China First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China State Key Laboratory of Marine Geology Tongji UniversityShanghai 20092China

Antarctica’s marginal seas are of great importance to atmosphere-ocean-ice interactions and are sensitive to global climate *** factors account for the freshwater budget in these regions,including glacier melting,seasonal formation/decay of sea ice,and ***(H)and oxygen(O)isotopes represent useful proxies for determining the distribution and migration of water *** analyzed the H and O isotopic compositions of 190 seawater samples collected from the Amundsen Sea during the 34th Chinese Antarctic Research Expedition in 2017/*** upper-oceanic structure(3%)of freshwater generally lie in the upper~50 m and extend from Antarctica to~65°S in the meridional direction(anomalously low freshwater proportion occurred between 68°S and 71°S).Winter Water mainly occupied the layer between 50 and 150 m south of 71°S in the western Amundsen *** water structure and spatial distribution of freshwater in the upper Amundsen Sea were found influenced mainly by the rates of basal and surficial melting of ice shelves,seasonal alternation of sea ice melt/formation,wind forcing,and regional *** to the distance between heavy sea ice boundary(HSIB)and ice shelves is much shorter in the western HSIB than the east HSIB,the western part of the heavy sea ice boundary includes a higher proportion of freshwater than the eastern regi

关键词： hydrogen and oxygen isotopes freshwater ice shelf sea ice upwelling Circumpolar Deep Water Amundsen Sea Southern Ocean

Effect of γ-PGA Coated Urea on N-Release Rate and Tomato Growth

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Wuhan University Journal of Natural Sciences 2014年第4期19卷 335-340页

作者： JIANG Yue LIU Liming luo guangfu ZHANG Zhanli Davidmark J HUANG Yingping Engineering Research Center of Eco-environment in Three Gorges Reservoir Region Ministry of EducationChina Three Gorges University Hubei Yihua Chemical Industry Company Ltd.

The anionic polymer γ-polyglutamic acid （γ-PGA） was used to coat urea and slow its dissolution. Three types of slow release urea （SRU） fertilizers （polymer coated urea with pore constriction, polymer coated urea with enzyme inhibitor and polymer coated urea with pore constriction and enzyme inhibitor） were prepared and tested for the N-release rate. After using SRU, the effect on the tomato growth was analyzed. The extracts of SRU were analyzed for NH3/NH4＋-N and NO3--N. The N-release rate was used to determine the optimum ratio of ingredients. The results show that the three types of SRU met the dissolution rate standards recommended by the Com- mittee of European Normalization. γ-PGA SRU increased the chlorophyll content of tomato （flowering stage） by an average of 100% compared with that grew in untreated urea. The results from soil analysis （0-60 cm in tomato pots） indicate that the content of NH3/NH4＋-N in SRU-treated pots was 25%-61% higher than that in soil from urea-treated pots during the growing period, while the content of NO3--N was nearly 50% lower after the tomato had been harvested. Newly formulated SRU fertilizer increases nitrogen up- take and reduces loss of applied nitrogen. Plant growth is enhanced, a valu- able resource is conserved, and the aquatic environment benefits from de- creased level of nitrate in agricultural run-off.

关键词： γ-PGA slow release urea (SRU) fertilizer nitrogen releaserate tomato growth

Selection of Single-Walled Carbon Nanotubes According to Both Their Diameter and Chirality via Nanotweezers

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Nano Research 2010年第4期3卷 296-306页

作者： Jing Zhou Hong Li Jing Lu guangfu luo Lin Lai Rui Qin Lu Wang Shigeru Nagase Zhengxiang Gao Waining Mei Guangping Li Dapeng Yu Stefano Sanvito State Key Laboratory of Mesoscopic Physics and Department of Physics Peking UniversityBeijing 100871China Department of Theoretical Molecular Science Institute for Molecular ScienceOkazaki 444-8585Japan Department of Physics University of Nebraska at OmahaOmahaNebraska 68182-0266USA SICAS Center Lee HallSUNY OneontaOneontaNY 13820USA School of Physics and CRANN Trinity CollegeDublin 2Ireland

Diameter- and chirality-dependent interactions between aromatic molecule-based nanotweezers and single-walled carbon nanotubes (SWNTs) are revealed by density functional theory calculations. We found that the threshold diameter of selected SWNTs is determined by the end-to-end distance of the nanotweezer. Large-diameter SWNTs are preferred by a nanotweezer with an obtuse folding angle, whereas small-diameter SWNTs are favored by a nanotweezer with an acute folding angle. The adsorption can be further stabilized by the orientational alignment of the hexagonal rings of the nanotweezer and the SWNT sidewall. Therefore, by taking advantage of the supramolecular recognition ability of the aromatic molecule-based nanotweezer, SWNTs can be enriched with both controllable diameter and chirality.

关键词： Carbon nanotubes nanotweezer selective adsorption density functional theory

Magnetism in Carbon Nanoscrolls: Quasi-Half-Metals and Half-Metals in Pristine Hydrocarbons

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Nano Research 2009年第11期2卷 844-850页

作者： Lin Lai Jing Lu Lu Wang guangfu luo Jing Zhou Rui Qin Yu Chen Hong Li Zhengxiang Gao Guangping Li Wai Ning Mei Yutaka Maeda Takeshi Akasaka and Stefano Sanvito State Key Laboratory for Mesoscopic Physics and Department of Physics Peking UniversityBeijing 100871China Department of Physics University of Nebraska at OmahaOmahaNebraska 68182-0266USA SICAS Center Lee HallSUNY OneontaOneontaNY 13820USA Department of Chemistry Tokyo Gakugei UniversityTokyo 184-8501Japan PRESTO Japan Science and Technology Agency4-1-8 Honcho KawagushiSaitamaJapan Center for Tsukuba Advanced Research Alliance University of TsukubaIbaraki 305-8577Japan School of Physics and CRANN Trinity CollegeDublin 2Ireland

A magnetic ground state is revealed for the first time in zigzag-edged carbon nanoscrolls(ZCNSs)from spin-unrestricted density functional theory *** their flat counterpart-zigzag-edged carbon nanoribbons,which are semiconductors with spin-degenerate electronic structure-ZCNSs show a variety of magnetic configurations,namely spin-selective semiconductors,metals,semimetals,quasi-half-metals,and *** the best of our knowledge,this is the first discovery of quasi-half-metals and half-metals in a pure hydrocarbon without resort to an external electric *** addition,we calculated the spin-dependent transportation of the semiconducting ZCNSs with 12 and 20 zigzag chains,and found that they are 13% and 17% at the Fermi level,respectively,suggesting that ZCNS can be an effective spin filter.

关键词： Carbon nanoscrolls quasi-half-metals half-metals graphene spin-selective spin filter

Visible light-induced N-doped TiO_2 nanoparticles for the degradation of microcystin-LR

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Science China Chemistry 2010年第8期53卷 1793-1800,1833-1835页

作者： YANG Jing,CHEN DengXia,DENG AnPing,FANG YanFen,luo guangfu,LI DeJiang,LI RuiPing & HUANG YingPing Alan G.MacDiarmid Research Institute of Renewable Energy,China Three Gorges University,Yichang 443000,China 1. Alan G. MacDiarmid Research Institute of Renewable Energy China Three Gorges University Yichang 443000 China

N-doped nano-crystalline TiO2 powders have been synthesized by the sol-gel *** shape and crystal structure of the resulting N-doped TiO2 were investigated by X-ray Photoelectron Spectroscopy (XPS),X-ray spectroscopy (XRD),Transmission Electron Microscopy (TEM) and UV-vis reflection *** results showed that doping TiO2 with nitrogen can lower its band gap and apparently shift its optical response to the visible *** the visible light (λ> 420 nm) irradiation,the MC-LR was degraded by the synthesized N-TiO2 *** variation of MC-LR amount and its intermediates were detected by high performance liquid chromatography (HPLC) and LC-MS,*** mineralization of MC-LR was determined by total organic carbon (TOC) ***,transient oxidative species generated during photocatalysis were tracked by electron spin resonance (ESR) and Peroxidase *** these results indicated that visible-light excited N-TiO2 can activate molecular oxygen and thereby achieve degradation of MC-LR completely within 14 *** removal of 59% of TOC was achieved after 20 h *** major oxidative species in the system were hydroxyl radical (·OH) and H2O2.13 Kinds of intermediates were primarily identified in the *** on these results,a reasonable conclusion was drawn for the degradation of MC-LR wherein its four positions are easy to be attacked by the photo-generated OH radical followed by the hydrolyzation of peptides.

关键词： visible Light microcystin-LR N-doped titanium dioxide photocatalysis

Oxidation State as a Descriptor in Oxygen Reduction Electrocatalysis

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CCS Chemistry 2022年第11期4卷 3587-3598页

作者： Ning Qin Sicen Yu Zongwei Ji Yanfang Wang Yingzhi Li Shuai Gu Qingmeng Gan Zhenyu Wang Zhiqiang Li guangfu luo Kaili Zhang Zhouguang Lu Department of Materials Science and Engineering Shenzhen Key Laboratory of Interfacial Science and Engineering of MaterialsSouthern University of Science and TechnologyShenzhen 518055 Department of Mechanical Engineering City University of Hong KongKowloonHong Kong 999077 Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and TechnologyShenzhen 518055

Electrocatalysts for the oxygen reduction reaction(ORR)are critically important in the development of fuel cells and metal-air *** research interests have been devoted to improving the electrocatalytic performance by tuning the morphology and defect-active ***,we demonstrate that the oxidation state can also serve as an effective strategy for designingORR *** of silver with gradient chemical valence from zero valence to trivalence were successfully *** oxidation states were evaluated by cryo-X-ray photoelectron spectroscopy,X-ray absorptionfinestructure,and electron paramagnetic resonance *** the first time,our results demonstrated that the electrocatalytic activities of silver species can be improved by increasing their valence,conforming the orderofAg

关键词： silver oxides high valence oxygen reduction oxidation state electrocatalysis

过氧化物模拟酶空间结构及介质微环境对酶催化反应的影响

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分析化学 2005年第5期33卷 599-604页

作者：黄应平罗光富罗勇军蔡汝秀武汉大学化学系宜昌443002 武汉430072 三峡大学化学系

在水溶液及胶束介质中分别研究了血红蛋白(hemoglobin,Hb),β环糊精氯化血红素(βCDhemin)和氯化血红素(hemin)作为过氧化物模拟酶对隐性亮绿(recessivebrilliantgreen,RBG)H2O2(或溶解氧)体系的催化特性。在Tween80存在下,通过测定米... 详细信息

在水溶液及胶束介质中分别研究了血红蛋白(hemoglobin,Hb),β环糊精氯化血红素(βCDhemin)和氯化血红素(hemin)作为过氧化物模拟酶对隐性亮绿(recessivebrilliantgreen,RBG)H2O2(或溶解氧)体系的催化特性。在Tween80存在下,通过测定米氏常数Km和Vmax,比较了酶催化活性的大小,结果表明催化活性Hb>βCDhemin>hemin。分别研究了辣根过氧化物酶(horseradishperoxidase,HRP),βCDhemin,hemin和四羧基苯基锰卟啉(MnTCPP)对4氨基安替比林(4AAP)2,3,4三氯苯酚(2,3,4trichlorophenol,TCP)体系的催化显色作用,酶及模拟酶催化活性比较为HRP>βCDhemin>hemin>MnTCPP。根据实验结果,讨论了胶束介质对RGB溶解氧催化体系的作用方式以及4AAPTCP酶催化体系的MichaeliMenten方程,并从不同空间结构(结合部位)模拟过氧化物酶催化性能的角度讨论了结合部位在酶催化反应中的有效作用。

关键词：过氧化物模拟酶胶束介质结合部位

Possible mechanism for the degradation of toxic organic pollutants by FePcCl16 under UV and visible light

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Possible mechanism for the degradation of toxic organic poll...